Active negative pressure control device and control system thereof

Abstract

The utility model discloses an active negative pressure control device and a control system thereof, and belongs to the technical field of air conditioners. The active negative pressure control system comprises a negative pressure data acquisition device; the frequency converter is used for adjusting the rotating speed according to the input electric signal; and the control device is used for sending a control signal to the frequency converter according to the control signal sent by the negative pressure data acquisition device so as to control the frequency converter. Compared with the prior art, the utility model has the advantages that: according to the scheme, the rotating speed of the fan of the equipment is controlled by judging the pressure in different equipment and comparing the pressure with laboratory data, so that the normal operation of the equipment is ensured; most problems of water blowing and water leakage in actual operation can be avoided, and alarm information can be timely and accurately sent.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more specifically, to an active negative pressure control device and its control system. Background Art

[0002] In the technical field of air conditioners, an industrial wet film humidifier is an evaporation-type mist-free humidifier. Water penetrates downward along the wet film material under the action of gravity. When the water is absorbed by the wet film material, a uniform water film is formed. When dry air passes through the wet film material, water molecules fully absorb the heat in the air and vaporize and evaporate, increasing the humidity of the air to form humid air. At the same time, on the premise that the enthalpy value of the air remains unchanged, the increase in air humidity causes the temperature to drop. Therefore, it can achieve the effects of increasing the environmental humidity, being clean and noiseless, and humidifying and cooling, and can purify the indoor air, having the advantages of automatic humidity control, automatic cleaning function, safety protection mechanism, and free setting of wind speed. It is especially suitable for humidifying in places such as clean workshops, computer rooms, the electronics industry, and the pharmaceutical industry to create a comfortable environment and promote production.

[0003] However, when the air conditioner operates in the cooling mode, gaseous water molecules in the air will condense on the surface of the evaporator when the air flows through the evaporator. The fan driving the air to flow through the heat exchanger may carry out the condensed water on the surface of the evaporator; and in the heating mode and humidifying state, the air flowing through the wet film humidifier may also carry out the humidifying water on the surface of the wet film, resulting in the air conditioner blowing water, accumulating water in the air duct and even damaging the fan. In addition, for air treatment equipment with humidifying or dehumidifying and air filtering functions, the filter screen will become dirty and blocked after being used for a period of time. For negative pressure equipment, if the fan power is kept constant, the negative pressure inside the equipment will increase significantly, the water level in the water receiving tray will rise, causing problems such as equipment leakage.

[0004] In the related art, for example, Chinese Patent Document CN116241995A discloses a method for controlling an air conditioner, including determining the actual dehumidification amount of the air conditioner; comparing the actual dehumidification amount of the air conditioner with a dehumidification amount threshold; and reducing the operating frequency of the compressor or reducing the rotational speed of the fan according to the comparison result. However, the related art does not give any technical inspiration for solving the problems of water splashing in the humidifying mode and water leakage in the water receiving tray when the filter screen is seriously dirty and blocked. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] Aiming at the problems of water splashing in the humidification mode and water leakage in the water receiving tray in the case of serious filter clogging in the prior art, the utility model provides an active negative pressure control device and its control system, which can realize the control of the fan speed of the device by judging the pressure in different devices and comparing it with the laboratory data, ensuring the normal operation of the device, avoiding most of the water blowing and leakage problems in actual operation, and sending alarm information in a timely and accurate manner.

[0007] 2. Technical solution

[0008] The purpose of the utility model is achieved through the following technical solutions.

[0009] An active negative pressure control system of the utility model includes a negative pressure data acquisition device for acquiring the negative pressure value of air; a frequency converter for adjusting the speed according to the input electrical signal; and a control device for sending a control signal to the frequency converter according to the control signal sent by the negative pressure data acquisition device to control the frequency converter.

[0010] Furthermore, the negative pressure data acquisition device is an air pressure sensor.

[0011] Furthermore, the active negative pressure control system further includes a frequency control solenoid valve for adjusting the frequency according to the input electrical signal; wherein, the control device controls the frequency control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device to adjust the frequency.

[0012] Furthermore, the active negative pressure control system further includes an alarm control solenoid valve for displaying or closing the alarm information according to the control signal transmitted by the negative pressure data acquisition device; wherein, the control device sends a control signal to the alarm control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device to control the alarm control solenoid valve.

[0013] Furthermore, the active negative pressure control system further includes a first interaction device for displaying the alarm information according to the control signal transmitted by the negative pressure data acquisition device; wherein, the control device sends a control signal to the first interaction device according to the control signal transmitted by the negative pressure data acquisition device to display the alarm information.

[0014] Furthermore, the active negative pressure control system further includes a second interaction device for the user to operate to realize human-machine interaction operation; wherein, the control device sends a control signal to the frequency converter or / and the frequency control solenoid valve according to the control signal sent by the second interaction device.

[0015] An active negative pressure control device of the utility model includes the above-mentioned active negative pressure control system.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] By judging the pressure in different devices and comparing with the laboratory data, the present utility model controls the rotation speed of the device fan, ensuring the normal operation of the device; in addition, the present utility model can avoid most of the water blowing and leakage problems in actual operation, and can send alarm information in a timely and accurate manner, so as to timely transmit the operation status of the system to the operator so that the operator can perform manual intervention in the first time when the system has problems to avoid losses to the device. Brief description of the drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the active negative pressure control device in an embodiment of the present invention.

[0020] Explanation of the reference numerals in the figure: 100, fan; 200, negative pressure data acquisition device; 300, humidifier; 400, water receiving tray; 500, filter screen. Detailed implementation manners

[0021] The present utility model will be described in detail below in conjunction with the drawings in the specification and specific embodiments.

[0022] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope that the present utility model can implement.

[0023] As Figure 1 shown, an active negative pressure control system of the present utility model includes a negative pressure data acquisition device 200 for acquiring the negative pressure value of air; a frequency converter for adjusting the rotation speed according to the input electrical signal; and a control device for sending a control signal to the frequency converter according to the control signal sent by the negative pressure data acquisition device 200 to control the frequency converter.

[0024] In a specific embodiment, the negative pressure data acquisition device 200 may be an air pressure sensor. The air pressure sensor is used to measure gas pressure. It can convert the gas pressure into an electrical signal for output, thereby realizing the measurement, control, and monitoring of the gas. In this solution, the air pressure sensor is mainly used to monitor the negative pressure value of the air in the air conditioning system to help ensure the normal operation of the system.

[0025] Specifically, the negative pressure data acquisition device 200 is disposed between the cavity of the wet film humidifier 300 or dehumidifier and the cavity of the blower 100. By obtaining sensor data in real time, the negative pressure value of the air in the air conditioning system is monitored, thereby determining whether the unit is operating normally.

[0026] More specifically, the negative pressure data acquisition device 200 acquires a pressure value in the area between the wet film humidifier 300 and the cavity of the blower 100, and then acquires an external pressure value of the blower 100 (usually the atmospheric pressure), and calculates the pressure difference between the two acquired pressure values.

[0027] In a specific embodiment, the active negative pressure control system of this solution is used for the EC blower 100. The control device sends a control signal to the frequency converter according to the control signal sent by the negative pressure data acquisition device 200 to control the frequency converter, and controls the blower 100 motor through the frequency converter.

[0028] Specifically, the signal input interface of the frequency converter is 0 - 10V. The main board of the EC blower 100 calculates the required voltage value according to the pressure difference value to control the frequency converter, and further enables the frequency converter to control the rotational speed of the blower 100 motor, so as to realize the adjustment of the rotational speed of the EC blower 100 by the frequency converter according to the input electrical signal.

[0029] In a specific embodiment, after receiving the air pressure value transmitted by the air pressure sensor, the control device sends a control signal to the frequency converter to control the frequency converter. Among them, the control device can be an industrial controller such as a PLC that can receive or send information data.

[0030] In a specific embodiment, the active negative pressure control system further includes a frequency control solenoid valve for adjusting the frequency according to the input electrical signal; the control device controls the frequency control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device 200 to realize the adjustment of the compressor frequency. Controlling the compressor frequency through the frequency control solenoid valve in cooperation with controlling the rotational speed of the EC blower 100 by the frequency converter can control from multiple aspects of the rotational speed of the blower 100 and the compressor frequency, ensuring the normal operation of the equipment and avoiding most of the water blowing and leakage problems in actual operation.

[0031] In a specific embodiment, the active negative pressure control system further includes an alarm control solenoid valve, which is used to display or turn off alarm information according to the control signal transmitted by the negative pressure data acquisition device 200.

[0032] Specifically, the control device sends a control signal to the alarm control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device 200 to control the alarm control solenoid valve, and displays the alarm information on the main control screen of the control system and the background of the remote control center. The alarm information can timely convey the operation status of the system to the operator so that the operator can perform manual intervention in the first time when the system has problems to avoid losses to the equipment.

[0033] In a specific embodiment, the active negative pressure control system further includes a first interaction device, which is used to display alarm information according to the control signal transmitted by the negative pressure data acquisition device 200. The control device sends a control signal to the first interaction device according to the control signal transmitted by the negative pressure data acquisition device 200 to display the alarm information. Thereby, the rotation speed of the fan 100 is reduced to make the negative pressure value stable, ensuring that the equipment can still continue to work within a short time without water blowing, and the water in the water receiving tray 400 will not overflow; in addition, the first interaction device can also send alarm information such as excessive resistance of the filter screen 500 to remind the administrator to replace the new filter screen 500 in time.

[0034] In a specific embodiment, the active negative pressure control system further includes a second interaction device, which is used for the user to operate to realize man-machine interaction operation. The control device sends a control signal to the frequency converter or / and the frequency control solenoid valve according to the control signal sent by the second interaction device.

[0035] Specifically, the first interaction device and the second interaction device are mainly used to provide a man-machine interaction interface for the user to set data, and at the same time feedback various data received by the control device to the user. As a specific solution, the first interaction device and the second interaction device can adopt a touch display with a processing chip and a memory. The touch screen of the touch display can be used for display and the user can input data through touch. The user can realize man-machine interaction by operating the instructions on the touch screen. Using the touch screen as the carrier of the interaction module improves the intelligence level of man-machine interaction and reduces the operation difficulty. The first interaction device and the second interaction device are both concentrated in the same display device, and the display device is arranged in the operation room where the operator can see and operate. In this solution, the main control screen of the EC fan 100, the debugging software and the background software can all set the maximum and minimum rotation speeds of the fan 100 that meet the pressure difference range to realize the man-machine interaction operation of the user.

[0036] The control method of the active negative pressure control device of the present utility model, wherein the active negative pressure control device includes a negative pressure data acquisition device 200 for acquiring the negative pressure value of air;

[0037] A frequency converter for adjusting the rotational speed according to the input electrical signal;

[0038] A frequency control solenoid valve for adjusting the frequency according to the input electrical signal;

[0039] An alarm control solenoid valve for displaying or closing the alarm information according to the input control signal;

[0040] A first interaction device for displaying the alarm information according to the input electrical signal;

[0041] A second interaction device for the user to operate to achieve human-machine interaction operation;

[0042] The control method of the active negative pressure control device includes:

[0043] S100. In response to the control signal sent by the negative pressure data acquisition device 200, obtain the negative pressure value of the air corresponding to the control signal;

[0044] S200. Determine whether the negative pressure value of the air is greater than or equal to the set negative pressure threshold;

[0045] S300. If so, send a control signal to the frequency converter.

[0046] Specifically, in step S100, the negative pressure data acquisition device 200 is an air pressure sensor, which is arranged between the cavity of the wet film humidifier 300 or the dehumidifier and the cavity of the fan 100. The air pressure sensor acquires the real-time air pressure value between the cavity of the wet film humidifier 300 or the dehumidifier and the cavity of the fan 100 and transmits the air pressure value data to the control device. More specifically, the negative pressure data acquisition device 200 acquires a pressure value in the area between the wet film humidifier 300 and the cavity of the fan 100, and then acquires an external pressure value of the fan 100 (usually the atmospheric pressure), and makes a pressure difference between the two acquired pressure values. The control device compares the pressure difference of the received air pressure value with the negative pressure threshold measured in the equipment experiment (considering that they are all negative values, for the convenience of understanding, the absolute value will be used for comparison later).

[0047] In steps S200 to S300, it is judged whether the negative pressure value of the air is greater than or equal to the set negative pressure threshold value. Here, the set negative pressure threshold value is the smaller value of the negative pressure value of the critical water splashing tested by the corresponding device and the negative pressure value when the water level in the water receiving tray 400 is close to overflowing. When the negative pressure value of the air is greater than or equal to the set negative pressure threshold value, the operator sends an instruction to the frequency converter through the second interaction device to send a control signal to make the frequency converter control the motor speed of the fan 100, so as to realize that the frequency converter adjusts the speed of the EC fan 100 according to the input electrical signal until the negative pressure value of the air is less than the set negative pressure threshold value, thereby ensuring that the device can still continue to work without water splashing in a short time and the water in the water receiving tray 400 will not overflow. When the negative pressure value of the air is less than the set negative pressure threshold value, the normal operation of the fan 100 motor is maintained.

[0048] In a specific implementation, the control method of the active negative pressure control device further includes:

[0049] S400. Judge whether the negative pressure value of the air is greater than or equal to the set negative pressure threshold value. If so, send a control signal to the frequency control solenoid valve.

[0050] Specifically, the air pressure sensor collects the air pressure value between the cavity of the wet film humidifier 300 or dehumidifier and the cavity of the fan 100 in real time and transmits the air pressure value data to the control device. The negative pressure data acquisition device 200 collects a pressure value in the area between the wet film humidifier 300 and the cavity of the fan 100, and then collects an external pressure value of the fan 100 (usually the atmospheric pressure), and makes a pressure difference between the two collected pressure values. The control device compares the received pressure difference of the air pressure value with the negative pressure threshold value measured by the device experiment (considering that both are negative values, for the convenience of understanding, the absolute value will be used for comparison later).

[0051] Judge whether the negative pressure value of the air is greater than or equal to the set negative pressure threshold value. Here, the set negative pressure threshold value is the smaller value of the negative pressure value of the critical water splashing tested by the corresponding device and the negative pressure value when the water level in the water receiving tray 400 is close to overflowing. When the negative pressure value of the air is greater than or equal to the set negative pressure threshold value, the operator sends an instruction to the frequency control solenoid valve of the air compressor through the second interaction device to send a control signal to make the frequency control solenoid valve of the air compressor control the output frequency of the air compressor, so as to realize that the frequency control solenoid valve of the air compressor adjusts the output frequency of the air compressor according to the input electrical signal until the negative pressure value of the air is less than the set negative pressure threshold value, thereby ensuring that the device can still continue to work without water splashing in a short time and the water in the water receiving tray 400 will not overflow. When the negative pressure value of the air is less than the set negative pressure threshold value, the normal operation of the air compressor is maintained.

[0052] In a specific embodiment, the control method of the active negative pressure control device further includes:

[0053] S500. Determine whether the negative pressure value of the air is greater than or equal to a set negative pressure threshold; if so, send a control signal to the alarm control solenoid valve.

[0054] S600. Determine whether the negative pressure value of the air is greater than or equal to a set negative pressure threshold; if so, send a control signal to the first interaction device.

[0055] Specifically, the control device sends a control signal to the first interaction device according to the control signal transmitted by the negative pressure data acquisition device 200 to display an alarm message, and reminds the administrator to replace the new filter screen 500 in time by sending alarm messages such as excessive resistance of the filter screen 500 externally.

[0056] This application controls the fan speed of the device by judging the pressure in different devices and comparing it with the laboratory data, ensuring the normal operation of the device. At the same time, this application can avoid most of the water blowing and leakage problems in actual operation and can send alarm messages in a timely and accurate manner.

[0057] The above schematically describes the present invention and its implementation manners. This description is not restrictive. Without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Any reference numeral in the claims should not limit the claimed claim. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments to this technical solution without creative efforts without departing from the purpose of this creation, they should all fall within the protection scope of this patent. In addition, the word "including" does not exclude other elements or steps, and the word "a" before an element does not exclude including "multiple" such elements. The multiple elements stated in the product claims can also be implemented by one element through software or hardware. First, second, etc. are used to represent names and do not represent any specific order.

Claims

1. An active negative pressure control system, comprising: A negative pressure data acquisition device, used to collect the negative pressure value of air; Frequency converter, used to adjust the speed according to the input electrical signal; Features: A control device is used to send a control signal to the frequency converter according to the control signal sent by the negative pressure data acquisition device to control the frequency converter.

2. The active negative pressure control system according to claim 1, characterized in that: The negative pressure data acquisition device is an air pressure sensor.

3. The active negative pressure control system according to claim 1, characterized in that: The active negative pressure control system further includes a frequency control solenoid valve for adjusting the frequency according to an input electrical signal; Wherein, the control device controls the frequency control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device to adjust the frequency.

4. The active negative pressure control system according to claim 1, characterized in that: The active negative pressure control system further comprises an alarm control solenoid valve, which is used to realize the display or closing of alarm information according to the control signal transmitted by the negative pressure data acquisition device; Wherein, the control device sends a control signal to the alarm control solenoid valve according to the control signal transmitted by the negative pressure data acquisition device to control the alarm control solenoid valve.

5. The active negative pressure control system according to claim 1, characterized in that: The active negative pressure control system further comprises a first interaction device for realizing display of alarm information according to a control signal transmitted by the negative pressure data acquisition device; Wherein, the control device sends a control signal to the first interactive device to display alarm information according to the control signal transmitted by the negative pressure data acquisition device.

6. The active negative pressure control system according to claim 3, characterized in that: The active negative pressure control system further comprises a second interaction device, which is used for a user to operate to realize a human-computer interaction operation; Wherein, the control device sends a control signal to the frequency converter or\and the frequency control solenoid valve according to the control signal sent by the second interaction device.

7. An active negative pressure control device, characterized in that: The active negative pressure control device comprises the active negative pressure control system according to any one of claims 1 to 6.

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